Line-casting machine.



F. c. LUGKB DAIX.

LINE CASTING MACHINE.

APPLIOATION FILED 001'. s, 1912.

Patented June 17, 1913.

3 SHEETS-SHEET 1.

Q/VMI odes: JIWcM-TOz M A; am wu P. C. LUGKE DAIX.

LINE CASTING MACHINE.

APPLICATION FILED OUT. 8, 1912.

Patented June 17,1913.

3 SHEETS-SHEET 2.

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FRITZ CARL LUCKE DAIX, OF NEW YORK, N. Y.

LINE-CASTING MACHINE.

Specification of Letters Patent.

Application filed October 8, 1912.

Patented June 17,1913.

Serial No. 724,638.

. a melting pot wherefrom the molten metal is ejected at the proper time by means of an automatically operating pump, and ithas to do with means for relieving the suction action of the pump plunger on its return or back stroke, the tendency of which is to draw the metal from the interior" and back oft-he slug at which points it is still hot-,-

although the outer or front portions of the slug may have cooled to the point of solidi fication, the result of this action being to impair the solidity of the slug and thus to unfit it for good work.

The object of my invention is to provide a simple and eilective means of relieving this injurious suction action.

The preferred embodiment of my invention is illustrated in the accompanying drawing. in, which Figure 1 is a vertical section, from front to rear of the machine, of a melting pot embodying my improvement and so much of the parts of a line casting machine associated therewith as are requisite to an understanding of the improvement; 1 1g. '2 is a plan of the melting pot. Fig. 3 is a side elevation of the pump plunger detached. Figs. 4, 5, 6 are skeletonized vertical sections of the pump, without the surrounding melting pot, illustrative of the pump action in difierent positions of the plunger.

In Fig. 1 is represented a melting pot lof known type; 2 is the pot cover; 3 is the yielding connection between the pot and the mechanism by which the pot is moved to and from the mold; 4 is the mold carrier; 5 are the jaws of the'slotted mold mounted in a slide on said carrier 6 is the line of matrices closing the front of the slot in the mold, and mounted in a carrier of the kind represented in my reissued Patent No. 13,048 of December 7 1999. In the parts thus far described, there is nothing new. I

I come now to the parts in whlchmy present improvement is embodied.

A is the pump cylinder, open top and bet- \Vithin the with the melting pot, and has the customary spout a through which the molten metal ejected by the pump is delivered to the rear side of the mold slot. In the side of the cylinder are one or more inlet ports a through which the molten metal from the pot can enter the cylinder, these openings being located in the cylinder at a point below that reached by the plunger on its return stroke.

pump cylinder is the tubular plunger 13, cylindrical in shape. closed at its top by a head I) and open at its bottom. The plunger is of sufiiciently smaller external diameter than the internal diameter of the pump cylinder A, to leave between the two an annular space which is filled by a metallic sleeve C, with sutlicient snugness to act as a packing for the plunger, to prevent the upward escape, or undue escape, of the liquid metal between it and the cylinder, but still is slidably mounted upon the plunger which it encircles, so that itmay slide of a cross bar 0, held up against the lower end of the plunger by a nut and bolt connection, 0 with the plunger head b above. The flange b on the head of the plunger, is of sufficiently less diameter than the cylinder A to allow air from the space in the melting pot above the level of the molten metal to pass down freely between it and the cylinder. In the side of the plunger B, just below the flange b, are one or more ports or openings 6 through which air from the interior of the melting pot can pass down "into the interior of the plunger. The proportions and related movements of the respective parts are such that when the plunger'is at the end of its return or stroke, with the sleeve C resting on the lower flange 0, and both ports, a and I), open, as in Fig. 5, then as the plunger enters on its down stroke, as soon as it has moved down far enough to cover the air ports with the sleeve, at which time the sleeve will have brought up against the top flange b, as seen in Fig. 6, further downward movement of the plunger will close the liquid ports a in the pump cylinder, and both sets of ports a, 6 will remain closed until the termination of the down or ejecting stroke of the plunger, as indicated in Fig. 1, where the plunger is shown at the end of its down stroke. When the plunger, on its up or return stroke, begins to rise from this position, the suction within the body of the pump below the plunger, induced by this movement, will hold the sleeve down, while the plunger continues to rise, thus almost in-- stantly opening the air ports 6 and permitting air to enter the interior of the plunger, as seen in Fig. 4, thus equal-' izing the pressures within and without the pump; and as the sleeve continues to occupy this position (resting upon the lower flange a) during the remainder of the stroke, at the end of which the plunger returns to the position shown in Fig. 5, it will be seen that there will be during this time no suction action which will tend to draw the metal back away from the slotted mold into which it has been 'forced. The moment the parts take the position shown in Fig. 5, a new charge of the molten metal can enter the pump. The packing sleeve 0 is thus also in effect a sliding cylindrical slide valve through which the ports in plunger and pump respectively are controlled.

It will be noticed that in the plan view, Fig. 2, the melting pot structure is represented as a single casting with two separate melting pots arranged side by side, each, of course, with its own pump and spout, one or both of which may be operated at pleasureall that is needed in case one only is to be used, being .to disconnect or uncouple the pump of the other from its operating mechanlsm. This arrangement is convenlent' for casting long or short lines of type, or single types. In case it is required to cast-a short line, or a single type, all that is needed is to connect up with the operating mechanism, the pump of the selected pot, leaving the other inactive.

Having set forth my improvement and the best way now known to me of carrying the same into effect, I state in conclusion that I do not limit myself to the specific structural details hereinbefore shown and described in illustration of the invention, for manifestly the same can be considerably varied without departure from the spirit of the invention: But

What I claim therein as new and desire to secure by Letters Patent, is:

In a linotype machine, the combination of a melting pot; a pump cylinder contained within said pot, and provided with an ejecting spout; a tubular plunger within the cylinder, closed at top and open at bottom;

a packing sleeve interposed between the plunger and cylinder, mounted on and car ried by said plunger and slidable lengthwise thereof; means on the plunger for confining the sliding movement of the sleeve within prescribed limits; and air and liquid ports in the plunger and cylinder respectively, controlled by said packing sleeve, communicating the one with the air space in the melting pot above the level of the molten metal therein, and the other with the space containing the charge of molten metal, said ports being, by the action of the packing sleeve, closed during the ejecting stroke, and opened during the return stroke, of the plunger, substantially as and for the purposes hereinbefore set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

FRITZ CARL LUCKE nAIX. Witnesses:

KARL KAELBLE, WM. P. PARKER. 

